Where can I do a long retreat?

Could different people here recommend places I can do long retreats (in 2 months for example)? I wanted to do a retreat in the style of meditation I do right now: Mahasi Sayadaw following Ven. Ajhan Tong sirimangalo technique -- where you do mindful prostrations, then walking and sitting while using labeling. But they only agree for 10 days, and at the end of 10 days they tell you whether you can stay for another 10 days. So I'm looking for a place to go do a long retreat, of say 2 months -- it can be in different technique even (say even only metta for example) , that isn't close to it.